Process for producing a high-temperature superconductor containi

Details Process for producing a high-temperature superconductor containi Process for producing a high-temperature superconductor containi

1992-07-09

1993-08-24

Lieberman, Paul

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

423593, 423604, 505 73, 505782, C01B 1336, C01F 1144, C01G 302, C01G 2900

Patent

active

052389146

ABSTRACT:
The invention relates to a process for producing a bismuth-, copper-, strontium- and calcium-containing high-temperature superconductor, in which an aqueous solution is produced which has a pH of 0.5-4 and which contains the metals in an atomic ratio corresponding to a high-temperature superconductor, the solution is combined with an oxalic acid solution to precipitate the metals quantitatively as oxalates, the oxalates formed are separated off and decomposed thermally to form the oxides and the latter are reacted in the presence of oxygen at temperatures above 700.degree. C. to form the desired high-temperature superconductor. The process comprises concentrating the aqueous solution of the metal until a precipitate begins to appear and using the oxalic acid as a solution in an organic solvent which is miscible with water The oxalates are decomposed at 550-700.degree. C. in the presence of oxygen.

REFERENCES:
patent: 5077265 (1991-12-01), Ritter
patent: 5100871 (1992-03-01), Chen
patent: 5147848 (1992-09-01), Chang
Slusarenko "Sol gel preparations and physical properties of the superconducting phase Bi.sub.1 Sr.sub.1 Ca.sub.1 Cu.sub.2 O.sub.8 ", Journal of Solid State Chemistry v. 79 (no month provided) 1989 pp. 277-81.
Akihiko et al., Patent Abstracts of Japan, JP 1197352 (published Aug. 9, 1989 (Abstract plus Document as Laid-Open).
Tatsuya et al., Patent Abstracts of Japan, JP 1079060 (published Mar. 24, 1989.
Chen, F. H., Journal of Materials Science, No. 7, 3338-3346 (1990).
Chen, F. H. Materials Letters, No. 6/7, 228-232 (1989).

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